package demo529;

import java.util.HashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args) {
        Map<String,String> map = new HashMap();
        map.put("1","张三");
        map.put("2","王五");
        map.put("3","赵六");
        System.out.println(map.get("1"));



        System.out.println(map);
        map.put("1","张三");
        System.out.println(map);

    }
}
